A LevelPhysicsCIETopic Questions15. Ideal Gases15.1 The Mole

Syllabus Edition

First teaching 2023

First exams 2025

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The Mole (CIE A Level Physics)

Topic Questions

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1a
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Define the mole.

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1b
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It is possible to calculate the number of moles, n using the number of molecules and Avogadro's constant. 

Identify by placing a tick (✓) in the box next to the correct arrangement of this equation.

 
Possible equations Place a tick (✓) here to identify the correct equation
n space equals space N subscript A over N  
n space equals space N over N subscript A  
n space N space equals space N subscript A  
n space equals space N space N subscript A  

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1c
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Define the Avogadro constant.

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1d
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The molar mass equation is shown below.

 n space equals space m over M subscript r

State the meaning of the quantities m and Mr.

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2a
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State the number of atoms in one mole of:

From the data page:

  • Avagadro's constant, N subscript A space equals space 6.02 cross times 10 to the power of 23

(i)   Sodium

[1]

(ii)   Lithium

[1]

(iii)   Xenon

[1]

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2b
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Determine the number of atoms in one mole of oxygen gas, O2.

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2c
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Calculate the molar mass of oxygen gas, O2 and give the associated unit.

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2d
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Calculate the number of moles in 0.5 kg of oxygen gas.

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3a
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Use the following information to determine the molar mass of glucose, C6H12O6.

  • The atomic mass of hydrogen is 1
  • The atomic mass of carbon is 12
  • The atomic mass of oxygen is 16

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3b
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Calculate the number of moles of glucose in 600 g of glucose.

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3c
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Determine how many molecules of glucose there are in 600 g of glucose.

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3d
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Determine the mass of carbon in 600 g of glucose.

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1a
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Determine the number of atoms in 4.0 g of Nitrogen-14. 

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1b
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Explain the difference in the nuclear composition of nitrogen-14 and nitrogen-15. 

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1c
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State whether there are more atoms in 4 g of nitrogen-14 than in nitrogen-15. Explain your answer.

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2a
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Carbon-12 and oxygen-16 form the most abundant compound of carbon dioxide.

Determine the relative atomic mass of carbon dioxide. 

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2b
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Calculate the number of moles in 398 g of carbon dioxide. 

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2c
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Explain which is heavier the molar mass of carbon dioxide, CO2, or the molar mass of oxygen, O2. 

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3a
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The following information on the isotopes of the elements in methane (CH4) and sulphur dioxide (SO2) is available:

  • Carbon-12
  • Hydrogen-1
  • Sulphur-32
  • Oxygen-16
(i)
Determine the ratio of the molar mass of methane (CH4) and sulphur dioxide (SO2).
[3]
 
(ii)
State the number of moles of methane (CH4) required to equal the same mass of sulphur dioxide (SO2). 
[1]

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3b
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Methane (CH4) and sulphur dioxide (SO2) are mixed together in equal parts to form a gas of mass 880 g. 

Determine the number of moles of methane (CH4) and sulphur dioxide (SO2) contained within the gas. 

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3c
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In a new mix of methane (CH4) and sulphur dioxide (SO2) of mass 896 g. The two gases have been mixed in the ratio 4:1 methane to sulphur dioxide. 

Determine the number of moles of methane (CH4) and sulphur dioxide (SO2) contained within the gas. 

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